/* Copyright (c) 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.orkut.client.api.samples.greetings.server.db;

import com.google.inject.AbstractModule;

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;

/**
 * Guice bindings for db package.
 *
 * @author Shishir Birmiwal
 */
public class DbModule extends AbstractModule {
  private static PersistenceManagerFactory persistenceManagerFactory;

  @Override
  protected void configure() {
    bind(PersistenceManagerFactory.class).toInstance(getPMF());
  }

  // this badness is required for the corner case where cachedConfig is not initialized
  // and the JSP file is rendered the first time.
  public static PersistenceManagerFactory getPMF() {
    if (persistenceManagerFactory == null) {
      persistenceManagerFactory = JDOHelper.getPersistenceManagerFactory("transactions-optional");
    }
    return persistenceManagerFactory;
  }
}
